US5615705A - Control valve for heavy construction equipment having regeneration function - Google Patents
Control valve for heavy construction equipment having regeneration function Download PDFInfo
- Publication number
- US5615705A US5615705A US08/497,125 US49712595A US5615705A US 5615705 A US5615705 A US 5615705A US 49712595 A US49712595 A US 49712595A US 5615705 A US5615705 A US 5615705A
- Authority
- US
- United States
- Prior art keywords
- spool
- pressure
- regeneration
- control valve
- receiving portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
- F15B13/0403—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves a secondary valve member sliding within the main spool, e.g. for regeneration flow
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
- F15B2011/0246—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits with variable regeneration flow
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/8667—Reciprocating valve
- Y10T137/86694—Piston valve
- Y10T137/86702—With internal flow passage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87169—Supply and exhaust
- Y10T137/87233—Biased exhaust valve
- Y10T137/87241—Biased closed
Definitions
- the present invention relates to a control valve for heavy construction equipment having a regeneration function.
- Regeneration is to return a flow of fluid generated at return-side of an actuator to a supply-side of the actuator as a supplementary fluid in order to prevent a generation of a cavitation due to a shortage of fluid at the supply-side of the actuator and thereby achieving smoother operation.
- regeneration should be achieved utilizing the weight of an actuator associated with the regeneration, not a supply of fluid to the actuator obtained by a separate pumping means.
- regeneration is to use a return flow of highly pressurized fluid, obtained upon lowering a boom by the weight of the boom, for raising the boom.
- FIGS. 1 and 2 A typical conventional construction for achieving such a regeneration is illustrated in FIGS. 1 and 2.
- a control valve 100 is shown as having a main spool 101 in which a regeneration spool 103 is disposed to be resiliently biased at a predetermined pressure by a pressure setting spring 102.
- a regeneration spool 103 moves, switching of fluid passages provided in the control valve 100 between opened and closed states is carried out to achieve regeneration. This will be described in more detail.
- a fluid passage 104 is opened to allow the interior of the main spool 101 to communicate with an actuator port C.
- a pressure generated by the return flow of fluid through the actuator port C serves to push the regeneration spool 103 in the direction indicated by arrow B in FIG. 1.
- a part of the return fluid flow discharged out of the actuator port C returns toward a tank T via a fluid passage 105.
- the other part of the return fluid flows toward a pump P through a fluid passage 106 so that it is regenerated at the side of another actuator port opposite to the actuator port C, that is, the supply-side of the actuator.
- an object of the invention is to provide a control valve for heavy construction equipment, capable of appropriately adjusting the amount of fluid to be regenerated depending on the fluid amount delivered from the pump, thereby preventing a loss of pressure and achieving a more accurate and effective regeneration function.
- a control valve having a regeneration function comprising: a hollow valve body: a plurality of spaced ports provided at the valve body, the ports including a pump port, an actuator port, a regeneration port and a tank port; a hollow main spool movably disposed in the valve body; a regeneration spool movably disposed in the main spool and adapted to be moved by a flow of fluid delivered :from a pump through the pump port; a fluid passage provided at the main spool and adapted to communicate the actuator port and the tank port together, the fluid passage being opened or closed by the movement of the regeneration spool, whereby as the regeneration spool is moved by the fluid flow delivered from the pump, a part to be fed to the tank port, of a flow of fluid emerging from the actuator port is increased, while the part to be fed to the regeneration port Is correspondingly decreased.
- FIG. 1 is a sectional view of an essential part of a control valve, showing a conventional regeneration construction
- FIG. 2 is a sectional view of a detailed construction of the control valve shown in FIG. 1;
- FIG. 3 is a sectional view of a control valve having a regeneration function in accordance with an embodiment of the present invention.
- FIG. 3 there is illustrated a control valve for heavy construction equipment having a regeneration function in accordance with an embodiment of the present invention.
- the control valve includes a hollow valve body 1 and a hollow main spool 2 disposed in the interior of the valve body 1 such that it can move laterally, when viewed in the drawing, within a predetermined stroke.
- the valve body 1 is provided with a plurality of spaced ports including a pump port P, an actuator port C, a regeneration port R and a return port T.
- the main spool 2 is provided with a plurality of spaced fluid passages 6, 21, 22, 23, 24 and 25 each associated with its selected port of the valve body 1. As the main spool 2 moves, the ports P, C, R and T are allowed to communicate with their associated fluid passages 6, 21, 22, 23, 24 and 25 or are prevented from communicating therewith.
- the fluid passage 6 communicates with the pump port P
- the fluid passage 21 communicates with the actuator port C
- the fluid passage 22 communicates with the regeneration port R
- the fluid passages 23 and 24 communicate with the tank port T.
- the fluid passage 25 will be described hereinafter.
- a regeneration spool 3 is disposed in a hollow portion of the main spool 2 such that it can move laterally, when viewed in FIG. 3, within a predetermined stroke.
- the regeneration spool 3 is resiliently biased at one end by a predetermined pressure generated from a pressure setting spring 4.
- the other end of the regeneration spool 3 is sealably received in a hydraulic chamber 5 defined at one side of the hollow portion of the main spool 2.
- the fluid passages 23, 24 and 25 are adapted to communicate with the tank port T.
- the fluid passages 23 and 24 are opened only when no movement of the regeneration spool 3 occurs.
- the fluid passage 25 is opened.
- the opened degree or area of the fluid passage 25 is varied in proportion to the distance moved by regeneration spool 3.
- the flow of fluid delivered from the pump and then introduced in the hydraulic chamber 5 acts to push the regeneration spool 3 in direction B.
- the regeneration spool 3 cannot move in direction B at all.
- the fluid flow from the return-side actuator port C flows along the fluid passage 21 and then partially enters the regeneration port R via the fluid passage 22 so that it is supplied to a supply-side actuator port opposite to the actuator port C.
- the remaining part of the fluid flow enters the tank port T via the fluid passages 23 and 24 so that it returns to a tank (not shown).
- the regeneration spool 3 is forced to move in direction B, thereby causing even the fluid passage 25 to be opened.
- the opened area of the fluid passage 25 is proportional to the moved distance of the regeneration spool 3 proportional to the fluid amount delivered from the pump. Accordingly, an increased fluid amount delivered from the pump results in an increase in the return amount of fluid flowing toward the tank port T and a decrease in the regeneration amount of fluid passing through the regeneration port R.
- the part to be returned through the tank port T becomes smaller at a smaller fluid amount delivered the pump.
- the part to be supplied, for regeneration, to the supply-side of the actuator through the regeneration port R becomes larger.
- the flow of fluid from the return-side actuator port C involves a larger return part and a smaller regeneration part because the opened area of the fluid passage 25 returning the fluid to the tank is increased.
- the amount of fluid to be regenerated can be appropriately adjusted on the basis of the fluid amount delivered from the pump.
- the regeneration spool 3 has a pressure receiving portion 7 for receiving a spool moving pressure resulted from a flow of fluid emerging from the actuator port C, a back pressure-side portion 8 disposed opposite to the pressure receiving portion 8 and having the same area as the pressure receiving portion 7, and a communication fluid passage 9 extending throughout the regeneration spool 3 to communicate the pressure receiving portion 7 and the back pressure-side portion 8 together.
- the communication fluid passage 9 Through the communication fluid passage 9, the pressure receiving portion 7 and the back pressure-side portion 8 are kept under a balanced pressure. As a result, the flow of fluid emerging from the actuator port C cannot have any effect on the movement of the regeneration spool 3 at all.
- the movement of the regeneration spool 3 is dependent only on the relation between the pressure resulted from the fluid flow delivered from the pump and the predetermined pressure of the pressure setting spring 4. Since the predetermined pressure of the pressure setting spring 4 is a constant, the moved distance of the regeneration spool 3 is determined depending only on the fluid amount delivered from the pump.
- the moved distance of the regeneration spool is increased as the fluid amount delivered from the pump is increased.
- the increase in the moved distance of the regeneration spool results in an increase in the opened area of the fluid passage communicating with the tank port.
- the return part therefore, is increased, while the regeneration part is decreased.
- the present invention provides a control valve for heavy construction equipment, capable of appropriately adjusting the amount of fluid to be regenerated depending on the fluid amount delivered from the pump, thereby preventing a loss of pressure and achieving a more accurate and effective regeneration function.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR19940025400 | 1994-10-05 | ||
KR94-25400 | 1994-10-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
US5615705A true US5615705A (en) | 1997-04-01 |
Family
ID=19394424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/497,125 Expired - Fee Related US5615705A (en) | 1994-10-05 | 1995-06-30 | Control valve for heavy construction equipment having regeneration function |
Country Status (3)
Country | Link |
---|---|
US (1) | US5615705A (ja) |
JP (1) | JPH08121407A (ja) |
CN (1) | CN1120640A (ja) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5862831A (en) * | 1996-05-21 | 1999-01-26 | Volvo Construction Equipment Korea Co., Ltd. | Variable-regeneration directional control valve for construction vehicles |
EP1191234A1 (en) * | 2000-09-26 | 2002-03-27 | Hitachi Construction Machinery Co., Ltd. | Hydraulic recovery system for construction machine and construction machine using the same |
US20060081299A1 (en) * | 2004-10-14 | 2006-04-20 | Volvo Construction Equipment Holding Sweden Ab. | Hydraulic control valve with regeneration function |
US20110067767A1 (en) * | 2009-09-23 | 2011-03-24 | Parker Hannifin Corporation | Sequence valve |
US10047769B2 (en) * | 2014-04-29 | 2018-08-14 | Volvo Construction Equipment Ab | Flow control valve for construction equipment |
US10519940B2 (en) * | 2017-04-19 | 2019-12-31 | Caterpillar Inc. | Hydraulic drive system for a linearly actuated hydraulic piston pump |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103727086B (zh) * | 2014-01-20 | 2016-02-10 | 南京工程学院 | 一种液控比例阀 |
JP6084264B1 (ja) * | 2015-09-28 | 2017-02-22 | Kyb株式会社 | スプール弁装置 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4388946A (en) * | 1981-04-20 | 1983-06-21 | Linde Aktiengesellschaft | Valves |
-
1995
- 1995-06-30 US US08/497,125 patent/US5615705A/en not_active Expired - Fee Related
- 1995-06-30 JP JP7188362A patent/JPH08121407A/ja active Pending
- 1995-07-19 CN CN95108971.4A patent/CN1120640A/zh active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4388946A (en) * | 1981-04-20 | 1983-06-21 | Linde Aktiengesellschaft | Valves |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5862831A (en) * | 1996-05-21 | 1999-01-26 | Volvo Construction Equipment Korea Co., Ltd. | Variable-regeneration directional control valve for construction vehicles |
EP1191234A1 (en) * | 2000-09-26 | 2002-03-27 | Hitachi Construction Machinery Co., Ltd. | Hydraulic recovery system for construction machine and construction machine using the same |
US6502499B2 (en) | 2000-09-26 | 2003-01-07 | Hitachi Construction Machinery Co., Ltd. | Hydraulic recovery system for construction machine and construction machine using the same |
US20060081299A1 (en) * | 2004-10-14 | 2006-04-20 | Volvo Construction Equipment Holding Sweden Ab. | Hydraulic control valve with regeneration function |
US7337807B2 (en) * | 2004-10-14 | 2008-03-04 | Volvo Construction Equipment Holding Sweden Ab | Hydraulic control valve with regeneration function |
EP1647719A3 (en) * | 2004-10-14 | 2008-09-03 | Volvo Construction Equipment Holding Sweden AB | Hydraulic control valve with regeneration function |
US20110067767A1 (en) * | 2009-09-23 | 2011-03-24 | Parker Hannifin Corporation | Sequence valve |
US8408232B2 (en) * | 2009-09-23 | 2013-04-02 | Parker Hannifin Corporation | Sequence valve |
US10047769B2 (en) * | 2014-04-29 | 2018-08-14 | Volvo Construction Equipment Ab | Flow control valve for construction equipment |
US10519940B2 (en) * | 2017-04-19 | 2019-12-31 | Caterpillar Inc. | Hydraulic drive system for a linearly actuated hydraulic piston pump |
Also Published As
Publication number | Publication date |
---|---|
CN1120640A (zh) | 1996-04-17 |
JPH08121407A (ja) | 1996-05-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SAMSUNG HEAVY INDUSTRIES CO., LTD., KOREA, REPUBLI Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHO, HYUNG JOON;REEL/FRAME:007576/0903 Effective date: 19950624 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: VOLVO CONSTRUCTION EQUIPMENT KOREA CO., LTD., KORE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAMSUNG HEAVY INDUSTRIES CO., LTD.;REEL/FRAME:009561/0648 Effective date: 19981017 |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20050401 |